有关wcf中faultcontact,FaultException报错，"此错误的创建者未指定原因"

Question

[ServiceContract]
public interface IService1
{
[OperationContract]
[FaultContract(typeof(DivisorFaultException))]
int GetDiv(int a, int b);
}
[DataContract]
public class DivisorFaultException
{
[DataMember]
public string errorMessage;
}
public class Service1 : IService1
{
public int GetDiv(int a, int b)
{
try
{
// int result = a / b;
return a/b;
}
catch (DivideByZeroException e)
{
DivisorFaultException dfEx = new DivisorFaultException();
dfEx.errorMessage = "A number cannot be divided by zero.";
throw new FaultException(dfEx);
}

}
}

class Program
{
    static void Main(string[] args)
    {
        ServiceHost hostObj = new ServiceHost(typeof(Service1));
        BasicHttpBinding bindObj = new BasicHttpBinding();
        hostObj.AddServiceEndpoint(typeof(IService1), bindObj, "http://localhost:8000/Mywcf");
        hostObj.Open();
        Console.WriteLine("Service Ready...Press [Enter] to Stop...");
        Console.ReadLine();
        hostObj.Close();
    }
}
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